Laser-Driven Superradiant Ensembles of Two-Level Atoms near Dicke Regime
Laser-Driven Superradiant Ensembles of Two-Level Atoms near Dicke Regime
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DOI：
10.1103/physrevlett.127.243602
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发表时间：
2021-12-10
影响因子：
8.6
通讯作者：
Ferrier-Barbut, I
中科院分区：
文献类型：
--
作者：
Ferioli, G.;Glicenstein, A.;Ferrier-Barbut, I
本文报道了由激光冷却的二能级原子组成的拉长致密系综的超辐射发射的实验观测，其径向范围小于跃迁波长。在强驱动激光作用下，我们观察到该系统沿其对称轴是超辐射的。即使驱动激光与超辐射方向垂直，也会发生这种情况。这种超辐射改变了自发辐射，结果是改变了拉比振荡。我们还研究了几乎完全反转系统发射中的Dicke超辐射作为原子数目的函数。实验结果与从头算、超平均场计算定性一致。
We report the experimental observation of a superradiant emission emanating from an elongated dense ensemble of laser cooled two-level atoms, with a radial extent smaller than the transition wavelength. In the presence of a strong driving laser, we observe that the system is superradiant along its symmmetry axis. This occurs even though the driving laser is orthogonal to the superradiance direction. This superradiance modifies the spontaneous emission, and, resultantly, the Rabi oscillations. We also investigate Dicke superradiance in the emission of an almost fully inverted system as a function of the atom number. The experimental results are in qualitative agreement with ab-initio, beyond-mean-field calculations.